Hearkening back to Descartes' model of skepticism, the move toward establishing an identity is a pivotal one; within "I think, therefore I am," who exactly is the I?
John Locke and Personal Identity
Definition of a person
Locke's definition of a human is a "thinking intelligent being that has reason and reflection, and can consider itself as itself, the same thinking thing at different times and places,which it does only by that consciousness which is inseparable from thinking, and, as it seems to me, essential to it--it being impossible for anyone to perceive without perceiving that he does perceive." (CHU 17.9)
John Locke and Personal Identity
Definition of a person
Locke's definition of a human is a "thinking intelligent being that has reason and reflection, and can consider itself as itself, the same thinking thing at different times and places,which it does only by that consciousness which is inseparable from thinking, and, as it seems to me, essential to it--it being impossible for anyone to perceive without perceiving that he does perceive." (CHU 17.9)